An Evaluation Of The Joint Operation Of Ramp Metering And Variable Speed Limits Using Corsim
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An Evaluation Of The Joint Operation Of Ramp Metering And Variable Speed Limits Using Corsim
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Author : Evangelos Mintsis
language : en
Publisher:
Release Date : 2012
An Evaluation Of The Joint Operation Of Ramp Metering And Variable Speed Limits Using Corsim written by Evangelos Mintsis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The integrated control scenario is tested against the no control case, the VSL only case and the ramp metering only case. The results (i.e. network wide and link statistics) indicate that the integrated control case outperforms the rest of the traffic management scenarios.
Evaluating Ramp Metering And Variable Speed Limits To Reduce Crash Potential On Congested Freeways Using Micro Simulation
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Author : Albinder Singh Dhindsa
language : en
Publisher:
Release Date : 2005
Evaluating Ramp Metering And Variable Speed Limits To Reduce Crash Potential On Congested Freeways Using Micro Simulation written by Albinder Singh Dhindsa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Adaptive control systems categories.
Recent research at UCF into defining surrogate measures for identifying crash prone conditions on freeways has led to the introduction of several statistical models which can flag such conditions with a good degree of accuracy. Outputs from these models have the potential to be used as real-time safety measures on freeways. They may also act as the basis for the evaluation of several intervention strategies that might help in the mitigation of risk of crashes.
A Framework For Simulating Variable Speed Limit Algorithms In Corsim
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Author : Clark Letter
language : en
Publisher:
Release Date : 2011
A Framework For Simulating Variable Speed Limit Algorithms In Corsim written by Clark Letter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
ABSTRACT: A major problem associated with freeway operations around major cities is congestion occurrence during peak volume periods. Typically, bottlenecks at merging and diverging junctions as well as incidents create a shockwave that propagates upstream. One of the tools currently examined as a way to dampen the shockwave produced by this bottleneck is variable speed limits (VSL). Current micro-simulators do not provide an interface to easily simulate VSLs and evaluate their impact on traffic, thus simulation must be carried out through additional coding. This study creates a test-bed for simulating and evaluating multiple VSL algorithms using the Corridor Simulation (CORSIM) micro-simulator. Three algorithms for VSL control are selected and simulated to evaluate the effectiveness of each algorithm. The roadway used for the simulation is a 13-mile section of I-95 in Miami, Florida. A run-time extension (RTE) interface is built to communicate with the CORSIM simulation and replicate the VSL operations. Different threshold values are tested to evaluate the effectiveness of each algorithm under various settings. It was concluded that all but one of the scenarios tested show an improvement in the average travel speed and total travel time after VSL is implemented. The throughput for most scenarios showed an improvement when observed over the time duration of the congestion. Overall, the volume-based algorithm showed the most improvement in the simulations.
Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations
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Author : Jorge Andrés Laval
language : en
Publisher:
Release Date : 2019
Travel Time Optimization On I 285 With Improved Variable Speed Limit Algorithms And Coordination With Ramp Metering Operations written by Jorge Andrés Laval and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Express highways categories.
Towards An Efficient And Equitable Motorway System Using Ramp Metering And Variable Speed Limits
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Author : Duo Li
language : en
Publisher:
Release Date : 2015
Towards An Efficient And Equitable Motorway System Using Ramp Metering And Variable Speed Limits written by Duo Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Express highways categories.
Ramp metering (RM) and variable speed limits (VSL) are two important ITS tools aimed at improving the performance of motorway systems. The former improves the traffic flow conditions on motorway by limiting the inflow of vehicles from on-ramps; while the latter harmonizes the traffic flow on a motorway mainline by minimizing the variation in speed of vehicles obeying the VSL display. The main goal of this research is to improve the efficiency and equity performance of motorway systems using RM and VSL control measures. A number of RM and VSL control algorithms are proposed in this thesis to achieve this goal. They are assessed for a critical bottleneck section of Auckland Motorway using micro-simulation software AIMSUN. First of all, two existing RM algorithms are assessed namely: ALINEA and HERO. HERO outperformed ALINEA in terms of efficiency and equity benefits. Then, a logic tree based VSL control algorithm is also assessed. The results revealed that the existing logic tree based VSL algorithm cannot improve significantly mobility performance of motorway systems and is rather rough for the speed control. Two alternative VSL control algorithms are proposed namely: a modified logic tree based controller and a fuzzy logic based controller. Both utilize optimized control logics and detector-controller configurations. The proposed algorithms outperformed the existing one in terms of their mobility benefits. In the next step, an integrated RM and VSL control method is proposed to preserve the traffic flow at bottlenecks close to their capacity and avoid excessive delays at on-ramps. The integrated method shows prospect to improve further efficiency and equity performance of motorway systems than operating the RM and VSL controllers independently. Finally, the relationship between efficiency and equity is investigated using a modified HERO strategy; this is aimed at achieving a balance between efficiency and equity gains from RM control. A combined index is proposed combining Gini coefficient and total travel time into one index, which can serve as an objective function to solve the bi-objective control design problem.
Exploring The Potential Of Combining Ramp Metering And Variable Speed Limit Strategies For Alleviating Real Time Crash Risk On Urban Freeways
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Author : Kirolos Maged Haleem
language : en
Publisher:
Release Date : 2007
Exploring The Potential Of Combining Ramp Metering And Variable Speed Limit Strategies For Alleviating Real Time Crash Risk On Urban Freeways written by Kirolos Maged Haleem and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
In summary, Ramp Metering was more beneficial at congested situations, while Variable Speed Limits were more beneficial at free-flow conditions. At conditions approaching congestion, the combination of Ramp Metering and Variable Speed Limits produced the best benefits. These results illustrate the significant potential of ITS strategies to improve the safety and efficiency of urban freeways.
An Evaluation Of Entrance Ramp Metering For Freeway Work Zones Using Digital Simulation
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Author : Erdinc Oner
language : en
Publisher:
Release Date : 2009
An Evaluation Of Entrance Ramp Metering For Freeway Work Zones Using Digital Simulation written by Erdinc Oner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Road work zones categories.
Coordinated Ramp Metering Control With Variable Speed Limits For Swiss Freeways
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Author : Nikolas Geroliminis
language : en
Publisher:
Release Date : 2014
Coordinated Ramp Metering Control With Variable Speed Limits For Swiss Freeways written by Nikolas Geroliminis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Variable Speed Limit And Ramp Metering Control Of Highway Networks Using Lax Hopf Method
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Author : Suyash Chandra Vishnoi
language : en
Publisher:
Release Date : 2020
Variable Speed Limit And Ramp Metering Control Of Highway Networks Using Lax Hopf Method written by Suyash Chandra Vishnoi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
This work presents a novel optimization formulation to solve the problem of variable speed limit control on road networks modeled by the Lighthill-Whitham-Richards (LWR) partial differential equation. It also presents some mathematical rules that allow for a reduction in the size and computational time of the optimization problem. Using the analytical solutions to the LWR model, an optimization problem is formulated for the variable speed limit and ramp metering control of traffic on highway networks using the Lax-Hopf algorithm. The resulting problem, which is non-linear in the decision variables, is transformed into a Mixed Integer Linear Program. Examples are presented to show the effectiveness of the approach, including its application to a real-world highway network with multiple ramp connections. The possibility of linear relaxation of integer variables in the problem is also considered. Lastly, the method is compared to a classical Link Transmission Model formulation of the variable speed limit control problem
Evaluation Of Mobility Impacts Of Temporary Ramp Metering In Work Zones
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Author : Naghma Hassan
language : en
Publisher:
Release Date : 2012
Evaluation Of Mobility Impacts Of Temporary Ramp Metering In Work Zones written by Naghma Hassan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Road maintenance has been growing in the United States and brings a variety of challenges to the transportation profession. Work zone congestion is one of the most important factors contributing to the delay and safety of freeways. Many control methodologies have been applied to work zones in order to reduce freeway congestion and delay. One means of control is ramp metering, which has been deployed since 1963 in the United States and has proven to be successful. This thesis' objective is to evaluate and simulate the effect of ramp metering on freeway work zones; traffic performance measures such as delay, speed, and number of stops are used for the evaluation. A literature review showed that a main factor contributing to the freeway work zone delay is a high percentage of commercial trucks. Due to the role of truck percentage in work zone performance, effectiveness of ramp metering in work zone control is evaluated with different truck percentages. The lane configuration for all the studied sites work zones was 2 lanes to 1 lane, because it's frequency in real-world applications. In the evaluation of ramp metering in work zones, the traffic volumes investigated were less than, equal to, and more than capacity (650vph, 1240vph, and 1854vph). Mainline (a link used for trough traffic) truck percentage and ramp truck percentage varied from 10% to 40%, and 10% to 20%, respectively. As a result, a total of 8 cases were created and simulated using VISSIM traffic simulation software.